Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: May 2011
Authors: Li Ting Yang, Kun Peng Wang, Xiao Qing Zheng
Synthesis and characterization of alkyd resin based on soybean oil polyols
Xiaoqing Zheng, Litingb Yang, Kunpeng Wang
School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, P.
Soy-based alkyd resin has a great advantage on properties and structure.
With these capabilities and structures, alkyd resin has a great advantage of specific applications in the chemical industry.
The final molecular weight and the molecular structures of alkyd resin are completely determined by the composition and structure of acid and polyol in reaction.
The polyfunctional group in vegetable oil polyols is favorable for the production of alkyd with branched-chain structure.
Soy-based alkyd resin has a great advantage on properties and structure.
With these capabilities and structures, alkyd resin has a great advantage of specific applications in the chemical industry.
The final molecular weight and the molecular structures of alkyd resin are completely determined by the composition and structure of acid and polyol in reaction.
The polyfunctional group in vegetable oil polyols is favorable for the production of alkyd with branched-chain structure.
Online since: April 2007
Authors: Zhang Lian Hong, Li Xia Peng, Huang Guo, Min Quan Wang
Introduction
Since nanocrystal has many interesting physical and chemical characters based on its variable size and
surface chemical status, the architectural control of well-defined morphology for nanocrystal is an
important goal of materials chemistry and processing because the shape and texture of materials are
important parameters in determining materials properties in many aspects [1].
In recent years, preparations of yttrium oxide with mesoporous [3], platelets and needles [4], micro-prisms structures [5], nanorods or nanowires [6] and nanotubes [7] have been widely reported.
The lamina microprisms, about 16um in length and about 10 in aspect ratio, self-assembled into arrays with Y-type structure which could be clearly seen from the inset in Fig. 2(a).
On the other hand, the Y-type structure along their cross-sectional diameter direction was found for all products.
The different growing rates of various crystal planes might associate with their surface energies, the process forming Y-type structure may be illustrated by a mechanism proposed by Zhang [5].
In recent years, preparations of yttrium oxide with mesoporous [3], platelets and needles [4], micro-prisms structures [5], nanorods or nanowires [6] and nanotubes [7] have been widely reported.
The lamina microprisms, about 16um in length and about 10 in aspect ratio, self-assembled into arrays with Y-type structure which could be clearly seen from the inset in Fig. 2(a).
On the other hand, the Y-type structure along their cross-sectional diameter direction was found for all products.
The different growing rates of various crystal planes might associate with their surface energies, the process forming Y-type structure may be illustrated by a mechanism proposed by Zhang [5].
Online since: March 2014
Authors: Jing Liu, Xue Min Cui, Yan He, Jing Lin Huang, Yuan Yuan
The Preparation and Characterization of Geopolymer Based Inorganic Membranes
Liu Jing, He Yan, Yuan Yuan, Huang Jing-lin, Cui Xue-min *
Guangxi Key Lab of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, PR China
*Corresponding Author: Cui Xue-min; e-mail: cui-xm@tsinghua.edu.cn
Keywords: Geopolymer; Inorganic membranes
Abstract.
Moreover, we could change the structure of membranes through the adjustment of parameters.
The surface of the sample was very smooth, but its cross-section was of porous structure.
The evaporation of moisture in slurry formed the porous structure of membranes [8,10].
We could explain it as follows: the higher the modulus was, the tighter the internal structure of the membrane and the smaller the pore size would be.
Moreover, we could change the structure of membranes through the adjustment of parameters.
The surface of the sample was very smooth, but its cross-section was of porous structure.
The evaporation of moisture in slurry formed the porous structure of membranes [8,10].
We could explain it as follows: the higher the modulus was, the tighter the internal structure of the membrane and the smaller the pore size would be.
Online since: September 2013
Authors: Jun Zhang, Xue Jun He
The schematic structure of the system is shown in Fig. 1.
PLC program structure is shown in Fig. 3.
Fig. 2 System structure diagram Fig. 3 PLC program structure The main program (OB1) unconditionally calls each function block (FC1 to FC7).
“Variable structure fuzzy control based on particle swarm optimization for gas collector pressure”.Information and Control, 2008,37(3):327—333
Coke & Chemistry( USSR),2001, 64(7):72—76.
PLC program structure is shown in Fig. 3.
Fig. 2 System structure diagram Fig. 3 PLC program structure The main program (OB1) unconditionally calls each function block (FC1 to FC7).
“Variable structure fuzzy control based on particle swarm optimization for gas collector pressure”.Information and Control, 2008,37(3):327—333
Coke & Chemistry( USSR),2001, 64(7):72—76.
Online since: May 2011
Authors: Zhi Wei Wang, Zhi Xiang Bu, Li Shi Wang
Attempts to improve the ductility of the alloys by chemistry modifications or microstructural control have shown limited success [3-4].
This implies that the mechanically activated powders possess essentially the crystal structure of alpha Ti and Al, which has very similar features to its SAED pattern, that is, during the mechanical activation process the Ti and A1 structure is maintained in situ.
Conclusions a) The spark plasma synthesis can be performed on nanoscale particles of reactant materials to achieve a dense reaction product that substantially retains the ultrafine structure of the starting materials.
b) The grain growth and hence the loss of the nanocrystalline structure, which would normally be expected to occur after product formation, are minimized.
d) During the mechanical activation process the Ti and A1 structure is maintained in situ.
This implies that the mechanically activated powders possess essentially the crystal structure of alpha Ti and Al, which has very similar features to its SAED pattern, that is, during the mechanical activation process the Ti and A1 structure is maintained in situ.
Conclusions a) The spark plasma synthesis can be performed on nanoscale particles of reactant materials to achieve a dense reaction product that substantially retains the ultrafine structure of the starting materials.
b) The grain growth and hence the loss of the nanocrystalline structure, which would normally be expected to occur after product formation, are minimized.
d) During the mechanical activation process the Ti and A1 structure is maintained in situ.
Online since: April 2010
Authors: Erik Janzén, Adam Gali, Nguyen Tien Son, Andreas Gällström
., H-1111, Budapest, Hungary
2Department of Physics, Chemistry and Biology, Linköping University, Linköping, S-581 83, Sweden
a agali@eik.bme.hu
Keywords: PL, EPR, divacancy, spintronics
Abstract.
The fine electron structure and levels were studied by group theory.
Application of group theory can be very useful to understand the electronic structure of defects.
Summary We investigated the excitation spectrum and hyperfine structure of neutral divacancy in SiC by advanced theoretical calculations.
e) Fine structure of levels due to spin-spin (D,∆) and spin-orbit (λ) interaction.
The fine electron structure and levels were studied by group theory.
Application of group theory can be very useful to understand the electronic structure of defects.
Summary We investigated the excitation spectrum and hyperfine structure of neutral divacancy in SiC by advanced theoretical calculations.
e) Fine structure of levels due to spin-spin (D,∆) and spin-orbit (λ) interaction.
Online since: February 2014
Authors: Azwar Manaf, Viktor Vekky Ronald Repi, Bambang Soegiono
It has hexagonal crystal structure with space group Pb63/mmc (194) and lattice constants a = 5.9290Å. c = 23.4130Å.
For A00B10 comfirms of LaMnO3 phase with orthorombic structure, space group Pbnm(62) and lattice parameter are a=5.5520 Å, b = 5.7269 Å and c = 7.7365 Å.
The absorption band observed within this limit reveals the formation of the spinel structure [5, 6].
Trukhanov, “Magnetic and magnetotransport properties of La12-xBaxMnO3x/2 perovskite manganites,” Journal of Materials Chemistry, no. 13, p. 347–352, 2003
Naresh, “Structure, ac conductivity and complex impedance study of Co3O4 and Fe3O4 mixed spinel ferrites,” International Journal of Engineering, Science and Technology, vol. 2, no. 8, pp. 40-52, 2010
For A00B10 comfirms of LaMnO3 phase with orthorombic structure, space group Pbnm(62) and lattice parameter are a=5.5520 Å, b = 5.7269 Å and c = 7.7365 Å.
The absorption band observed within this limit reveals the formation of the spinel structure [5, 6].
Trukhanov, “Magnetic and magnetotransport properties of La12-xBaxMnO3x/2 perovskite manganites,” Journal of Materials Chemistry, no. 13, p. 347–352, 2003
Naresh, “Structure, ac conductivity and complex impedance study of Co3O4 and Fe3O4 mixed spinel ferrites,” International Journal of Engineering, Science and Technology, vol. 2, no. 8, pp. 40-52, 2010
Online since: April 2014
Authors: Supakorn Pukird, Worasak Sukkabot, Suttinart Noothongkaew, Ki Seok An
Among these structures, two-dimensional ZnO nanostructure such as ZnO nanowalls is intensively attracted.
All the diffraction peaks in the XRD pattern can be indexed to the hexagonal structure of ZnO.
XRD shows that the ZnO nanowalls are pure wurtzite structure and well c-oriented.
Pennycook, Applications of highly ordered wheel like structured ZnO nanorods, Adv.
[23]Wen Yu and Chunxu Pan, Low temperature thermal oxidation synthesis of ZnO nanoneedles and the growth mechanism, Materials Chemistry and Physics 115 (2009) 74-79
All the diffraction peaks in the XRD pattern can be indexed to the hexagonal structure of ZnO.
XRD shows that the ZnO nanowalls are pure wurtzite structure and well c-oriented.
Pennycook, Applications of highly ordered wheel like structured ZnO nanorods, Adv.
[23]Wen Yu and Chunxu Pan, Low temperature thermal oxidation synthesis of ZnO nanoneedles and the growth mechanism, Materials Chemistry and Physics 115 (2009) 74-79
Online since: March 2016
Authors: Ling Min Zeng, De Gui Li, Liu Qing Liang, Shu Hui Liu, Ming Qin
To the best of our knowledge, ten ternary compounds with distinct structures of the Dy–Co–Ga system have been reported: DyCo4Ga, DyCo0.2Ga1.8, DyCo4.15Ga0.85 and DyCo3.55Ga1.45 with the CaCu5-type structure, DyCo1.33Ga0.67(MgZn2-type structure) , DyCoGa (CoGdGa-type structure), DyCo0.67–0.35Ga1.33–1.65 (GdPdSi-type structure), DyCo0.25–0.15Ga1.75–1.85(AlB2-type), DyCo5.01Ga6.99(Fe6Ga6Sc-type), Dy2Co11.7Ga5.3 (Th2Zn17-type) and Co14.4 Dy6 Ga3.6(CeNi3-type) (e.g.[4-9]).
The paramagnetic Curie temperature θp = 40.4 K was also obtained by the fit to the Curie–Weiss law and the positive value of θp may indicate the ferromagnetically ordered structure of DyCo0.67Ga1.33.
Bulyk, Koordinatsionnaya Khimiya (= Coordination Chemistry (USSR)). 18(1992) 445-448
The paramagnetic Curie temperature θp = 40.4 K was also obtained by the fit to the Curie–Weiss law and the positive value of θp may indicate the ferromagnetically ordered structure of DyCo0.67Ga1.33.
Bulyk, Koordinatsionnaya Khimiya (= Coordination Chemistry (USSR)). 18(1992) 445-448
Online since: January 2013
Authors: Liu Sen, Song Liu
The alignment was adjusted to keep the secondary structures of KaiB of S. elongatus PCC 7942 intact.
The high conservation of the KaiB sequence could indicate that KaiB protein was introduced into this clock system, or its sequence is highly conserved for its structure and biological functions.
The secondary structure is from the KaiB structure of S. elongatus PCC 7942, and the top ruler numbers are for the KaiB sequence of S. elongatus PCC 7942.
KAGEYAMA, “Circadian Formation of Clock Protein Complexes by KaiA, KaiB, KaiC, and SasA in Cyanobacteria,” Journal of Biological Chemistry, vol. 278, no. 4, pp. 2388–2395, Nov. 2002
LiWang, “Structure and function from the circadian clock protein KaiA of Synechococcus elongatus: a potential clock input mechanism,” Proc.
The high conservation of the KaiB sequence could indicate that KaiB protein was introduced into this clock system, or its sequence is highly conserved for its structure and biological functions.
The secondary structure is from the KaiB structure of S. elongatus PCC 7942, and the top ruler numbers are for the KaiB sequence of S. elongatus PCC 7942.
KAGEYAMA, “Circadian Formation of Clock Protein Complexes by KaiA, KaiB, KaiC, and SasA in Cyanobacteria,” Journal of Biological Chemistry, vol. 278, no. 4, pp. 2388–2395, Nov. 2002
LiWang, “Structure and function from the circadian clock protein KaiA of Synechococcus elongatus: a potential clock input mechanism,” Proc.